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Use dedicated WIC methods to get sub-bitmap of IWICBitmap

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Using IWICBitmapClipper it is possible to get a clipped version
of the source bitmap so it should be used instead of manual way
with extracting pixels to the memory.
This commit is contained in:
Artur Wieczorek
2021-02-20 21:00:11 +01:00
parent 9b1829c300
commit 0631ee37d9
1 changed files with 7 additions and 17 deletions
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24
src/msw/graphicsd2d.cpp
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@@ -2601,26 +2601,16 @@ public:
wxD2DBitmapResourceHolder* GetSubBitmap(wxDouble x, wxDouble y, wxDouble w, wxDouble h) const
{
wxCOMPtr<IWICBitmapClipper> clipper;
HRESULT hr = wxWICImagingFactory()->CreateBitmapClipper(&clipper);
wxCHECK2_HRESULT_RET(hr, NULL);
WICRect r = { (INT)x, (INT)y, (INT)w, (INT)h };
WICPixelFormatGUID fmt;
m_srcBitmap->GetPixelFormat(&fmt);
wxASSERT_MSG(fmt == GUID_WICPixelFormat32bppPBGRA || fmt == GUID_WICPixelFormat32bppBGR, "Unsupported pixel format");
UINT bufStride = 4 * r.Width;
UINT bufSize = 4 * r.Width * r.Height;
BYTE* pixBuffer = new BYTE[bufSize];
HRESULT hr = m_srcBitmap->CopyPixels(&r, bufStride, bufSize, pixBuffer);
if ( FAILED(hr) )
{
delete[] pixBuffer;
wxFAILED_HRESULT_MSG(hr);
return NULL;
}
hr = clipper->Initialize(m_srcBitmap, &r);
wxCHECK2_HRESULT_RET(hr, NULL);
wxCOMPtr<IWICBitmap> subBmp;
hr = wxWICImagingFactory()->CreateBitmapFromMemory(r.Width, r.Height, fmt, bufStride, bufSize, pixBuffer, &subBmp);
delete[] pixBuffer;
hr = wxWICImagingFactory()->CreateBitmapFromSource(clipper, WICBitmapNoCache, &subBmp);
wxCHECK2_HRESULT_RET(hr, NULL);
return new wxD2DBitmapResourceHolder(subBmp);